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Vacuum freeze-drying tester

A vacuum freeze-drying and experimental machine technology, which is applied in the drying of solid materials, method combination to dry solid materials, drying and other directions, can solve the problems of melting, microwave shielding and vacuum sealing, large heat loss and other problems, and achieve energy Uniform distribution, convenient for comparative analysis and comparison of related parameters, avoiding the effect of spark discharge

Active Publication Date: 2013-05-01
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The problem of microwave shielding and vacuum sealing has not been completely solved;
[0007] 2. Thermally conductive plastics may be deformed or melted due to prolonged exposure to microwaves;
[0008] 3. The use of heat-conducting glass, heat-conducting ceramics, etc., leads to excessive heat loss, which contradicts the purpose of saving energy by using microwave freeze-drying

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0135] Example: Take 500g of fresh winter jujube, after selection, cleaning and pitting, take 320g of hollow jujube for color protection, then move it into a common vacuum freeze-drying warehouse to evacuate, set the heating curve at the same time, set the temperature of the heating plate to 130°C, wait When the vacuum degree falls within the range of 3000-3500Pa, turn on the heating switch, start the heating curve, and heat and dry under vacuum. The drying time is about 3.7 hours, and 75.4g of dried dates are obtained with a moisture content of 16.2%.

[0136] 2. Microwave vacuum drying:

[0137] Operation process: (1) Start the compressor to lower the cold trap below -35°C;

[0138] (2) The preset vacuum pressure is 3000Pa, start the vacuum pump;

[0139] (3) Start the microwave power source, and adjust the value of microwave power (within 300-500W) according to the requirements of material characteristics and dryness. The microwave vacuum drying time is generally 0.5 to 2...

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Abstract

The invention discloses a vacuum freeze-drying tester, which comprises a freeze-drying device, a vacuum system, a refrigerating system and a control system, wherein the control system is respectively connected with the vacuum system, the refrigerating system and the freeze-drying device; the vacuum system and the refrigerating system are respectively connected with the freeze-drying device; the freeze-drying device comprises a vacuum freeze-drying device and a micro-wave freeze-drying device; the vacuum freeze-drying device is connected with the micro-wave freeze-drying device by a freeze-drying cut-off value; and the freeze-drying cut-off value is used for switching between vacuum freeze-drying and micro-wave freeze-drying to separately / simultaneously perform vacuum drying and micro-wavevacuum drying or separately / simultaneously perform vacuum freeze-drying and micro-wave freeze vacuum drying.

Description

technical field [0001] The invention relates to an experimental equipment for drying agricultural by-products or medicines, in particular to a vacuum freeze-drying experimental machine. Background technique [0002] Vacuum freeze-drying technology originated in 1890, when Altmann used it for the production of biological specimens. During World War II, due to a large number of applications in the medical field, the freeze-drying technology was developed rapidly. From the 1950s to the 1970s, foreign research on freeze-drying technology, especially in the field of food, was very active. Freeze-dried food has shown its unique characteristics and functions as soon as it comes out. Because of its good quality, fast rehydration, nutritional flavor, color and shape, all indicators are excellent. Therefore, it has its unique status in some special industries abroad, such as aviation, mountaineering, exploration, field combat and other fields. After China entered the 1980s, the ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B7/00
Inventor 李树君曹有福杨炳南韩清华李凤成马季威尚增山朱卫华付大军张雷
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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